Q. What is the root mean square (RMS) value of an alternating current (AC) if its peak value is 10 A?
A.
5 A
B.
7.07 A
C.
10 A
D.
14.14 A
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Solution
The RMS value of an AC is given by I_rms = I_peak / √2. Therefore, I_rms = 10 A / √2 = 7.07 A.
Correct Answer: B — 7.07 A
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Q. What is the root mean square (RMS) value of an alternating current (AC) that has a peak value of 10 A?
A.
5 A
B.
7.07 A
C.
10 A
D.
14.14 A
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Solution
The RMS value of an AC is given by I_rms = I_peak / √2. Therefore, I_rms = 10 A / √2 = 7.07 A.
Correct Answer: B — 7.07 A
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Q. What is the root mean square speed of gas molecules at temperature T?
A.
(3RT/M)^0.5
B.
(RT/M)^0.5
C.
(2RT/M)^0.5
D.
(RT/3M)^0.5
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Solution
The root mean square speed (v_rms) is given by the formula v_rms = (3RT/M)^0.5, where R is the gas constant, T is the temperature, and M is the molar mass.
Correct Answer: A — (3RT/M)^0.5
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Q. What is the root mean square speed of gas molecules directly proportional to?
A.
The square root of the temperature.
B.
The square of the temperature.
C.
The mass of the gas molecules.
D.
The volume of the gas.
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Solution
The root mean square speed of gas molecules is directly proportional to the square root of the absolute temperature, as given by the equation v_rms = sqrt(3kT/m).
Correct Answer: A — The square root of the temperature.
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Q. What is the root mean square speed of gas molecules in a container at temperature T?
A.
sqrt(3kT/m)
B.
sqrt(2kT/m)
C.
sqrt(kT/m)
D.
sqrt(3RT/M)
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Solution
The root mean square speed (v_rms) is given by the formula v_rms = sqrt(3kT/m) where k is the Boltzmann constant, T is the temperature, and m is the mass of a gas molecule.
Correct Answer: A — sqrt(3kT/m)
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Q. What is the root mean square speed of gas molecules in an ideal gas at temperature T?
A.
sqrt(3RT/M)
B.
sqrt(2RT/M)
C.
sqrt(RT/M)
D.
sqrt(3kT/m)
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Solution
The root mean square speed (v_rms) is given by the formula v_rms = sqrt(3RT/M), where R is the gas constant, T is the temperature, and M is the molar mass.
Correct Answer: A — sqrt(3RT/M)
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Q. What is the scalar product of A = (3, 4, 0) and B = (0, 0, 5)?
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Solution
A · B = 3*0 + 4*0 + 0*5 = 0.
Correct Answer: A — 0
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Q. What is the scalar product of the unit vectors i and j?
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Solution
i · j = 0, since they are orthogonal.
Correct Answer: B — 0
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Q. What is the scalar product of the vectors (3, 4) and (4, 3)?
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Solution
The scalar product is 3*4 + 4*3 = 12 + 12 = 24.
Correct Answer: B — 25
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Q. What is the scalar product of the vectors (4, -3, 2) and (1, 1, 1)?
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Solution
Scalar product = 4*1 + (-3)*1 + 2*1 = 4 - 3 + 2 = 3.
Correct Answer: D — 6
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Q. What is the scalar product of the vectors (5, -3) and (-2, 4)?
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Solution
Scalar product = 5*(-2) + (-3)*4 = -10 - 12 = -22.
Correct Answer: A — -6
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Q. What is the scalar product of the vectors (5, 5, 5) and (1, 2, 3)?
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Solution
Scalar product = 5*1 + 5*2 + 5*3 = 5 + 10 + 15 = 30.
Correct Answer: A — 30
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Q. What is the scalar product of the vectors A = (0, 1, 0) and B = (1, 0, 1)?
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Solution
A · B = 0*1 + 1*0 + 0*1 = 0.
Correct Answer: A — 0
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Q. What is the scalar product of the vectors A = (1, 1, 1) and B = (1, 1, 1)?
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Solution
A · B = 1*1 + 1*1 + 1*1 = 1 + 1 + 1 = 3.
Correct Answer: C — 3
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Q. What is the scalar product of the vectors A = (1, 2, 3) and B = (4, 5, 6)?
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Solution
A · B = 1*4 + 2*5 + 3*6 = 4 + 10 + 18 = 32.
Correct Answer: B — 30
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Q. What is the scalar product of the vectors A = (2, -1, 3) and B = (0, 4, -2)?
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Solution
A · B = 2*0 + (-1)*4 + 3*(-2) = 0 - 4 - 6 = -10.
Correct Answer: A — -10
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Q. What is the scalar product of the vectors A = (4, 0, -3) and B = (0, 5, 2)?
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Solution
A · B = 4*0 + 0*5 + (-3)*2 = 0 - 6 = -6.
Correct Answer: B — 0
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Q. What is the scalar product of the vectors K = (0, 1, 0) and L = (1, 0, 1)?
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Solution
K · L = 0*1 + 1*0 + 0*1 = 0 + 0 + 0 = 0.
Correct Answer: A — 0
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Q. What is the scalar projection of vector (3, 4) onto (1, 0)?
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Solution
Scalar projection = (3*1 + 4*0) / √(1^2) = 3
Correct Answer: A — 3
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Q. What is the scalar projection of vector A = (3, 4) onto vector B = (1, 0)?
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Solution
Scalar projection = (A · B) / |B| = (3*1 + 4*0) / 1 = 3.
Correct Answer: A — 3
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Q. What is the scalar triple product of the vectors (1, 2, 3), (4, 5, 6), and (7, 8, 9)?
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Solution
Scalar triple product = (1, 2, 3) · ((4, 5, 6) × (7, 8, 9)) = 0.
Correct Answer: A — 0
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Q. What is the scalar triple product of vectors A = (1, 0, 0), B = (0, 1, 0), C = (0, 0, 1)?
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Solution
Scalar triple product = A · (B × C) = 1.
Correct Answer: A — 1
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Q. What is the scalar triple product of vectors a = (1, 2, 3), b = (4, 5, 6), c = (7, 8, 9)?
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Solution
Scalar triple product = a · (b × c). Since b and c are linearly dependent, b × c = 0, hence the scalar triple product is 0.
Correct Answer: A — 0
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Q. What is the second derivative of f(x) = e^x sin(x)?
A.
e^x (sin(x) + cos(x))
B.
e^x (2sin(x) + cos(x))
C.
e^x (sin(x) - cos(x))
D.
e^x (sin(x) + 2cos(x))
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Solution
Using the product rule and chain rule, the second derivative is f''(x) = e^x (sin(x) + cos(x)).
Correct Answer: A — e^x (sin(x) + cos(x))
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Q. What is the second derivative of f(x) = e^x?
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Solution
The second derivative f''(x) = e^x.
Correct Answer: A — e^x
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Q. What is the second derivative of f(x) = x^4 - 4x^3 + 6x^2?
A.
12x - 12
B.
12x - 8
C.
12x - 6
D.
12x - 4
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Solution
f''(x) = 12x - 12.
Correct Answer: A — 12x - 12
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Q. What is the shape of a liquid droplet on a surface due to surface tension?
A.
Flat
B.
Cylindrical
C.
Spherical
D.
Cubical
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Solution
A liquid droplet takes a spherical shape because a sphere has the minimum surface area for a given volume, minimizing the energy associated with surface tension.
Correct Answer: C — Spherical
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Q. What is the shape of a molecule with the formula AX3E?
A.
Trigonal planar
B.
Tetrahedral
C.
Trigonal pyramidal
D.
Bent
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Solution
AX3E indicates three bonding pairs and one lone pair, resulting in a trigonal pyramidal shape.
Correct Answer: C — Trigonal pyramidal
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Q. What is the shape of the ammonia (NH3) molecule?
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Trigonal pyramidal
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Solution
Ammonia has a trigonal pyramidal shape due to the presence of a lone pair on the nitrogen atom.
Correct Answer: D — Trigonal pyramidal
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Q. What is the shape of the d orbitals?
A.
Spherical
B.
Dumbbell
C.
Double dumbbell
D.
Linear
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Solution
The d orbitals have a double dumbbell shape.
Correct Answer: C — Double dumbbell
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